Eraser for type-writing machines.



n. M. LEMON. ERASER FOR'TYPE WRITING MACHINES.

APPLICATION FILED JAN. 29, 1910.

- Patented Dec.20, 1910.

Snom/Lto@ 7 HIMMW A D. M. LEMON. EBASER FOR TYPE WRITING MACHINES.

APPLICATION FILED JAN. 29, 1910.

m... 9T Am 0B aw gown. Dm .ma m a P o Q o A m www UNITED STATE' an N DON iw. LEMON, or BOSTON, MASSACHUSETTS, ASSICNOE OE ONE-HALE To ERNEST v. y

' PAGE, OE BOSTON, MASSACHUSETTS; y

EEASEE EOE TYPE-WRITING MACHINES.

Application led'January 29, 1910. Serial No. 540,874.

T o all whom it 'may concern:

Be it known that I, DON' M. LEMON, a citizen of the United States, v resident of Boston, in the county of Suffolk and` State of Massachusetts, have made a Certain new and useful Invention in -Erasers `,for Use with Type-Writing Machines, and declare the following to be a full, clear, and exactl description-of the Same, such as will enable others skilled in the art to which it appertains to make and use'the invention, reference being had to the accompanying drawings, and to letters or figures-of reference marked thereon, which form a part of this specification,

Figure 1 1s a central-longitudinal section of my invention, with the parts thereof 1n .parallel relation; Fig. 2 isa perspectiveV view of the samewith the parts thereof in the positions assumed when applied to the typewriter, which is 'partly shown in dotted lines; Fig. 3 is a section on the line 3-3,

Fig. l; Fig. 4 is a detail side view of the ratchet wheel for the rotary shaft; Fig. 5 is a side view, partly broken away, showing a modification; Fig. 6 is a detail side view partly broken away of the joint of the upright carrier; 7 is a central vertical section of the push rod mechanism; and Fig. 8 is a detail perspective view of the rotary brush.

The invention has relation to-erasers for use with typewriting machinesto erase the printed impression when` desired, and it consists in the novel construction and combinations of partsas hereinafter set forth.

In the accompanying drawings, illustratl ing the invention, Fig. 1 designates an upright carrier, having at its upper end an incasement 2 having disposed therein a horizontal shaft 3 carrying arfast wheel l provided with a circular series of ratchet teeth 4?, set back therein or inset from its side face 4b, and a. loosevhollow grooved wheel 5,

mounted upon a sleeve 6a, forming a part.

of the incasement and in which the shaft 3, has loose bearings, said wheel 5, containing a helical spring 6 fastened at one end thereof to the sleeve 6a and at its other end to the wheel, the sidewall of the wheel' carrying a pivoted pawl 7 in, engagement with the teeth of the ratchet. The end portion 3a of the shaft 3, projecting from the incasement, hassurrounding the same a flexible covering or sheath 8 for a flexible shaft-9, said shaft OFFICE.

Patented Dec. 20, 1910.

forming a continuationof the shaft 3 and turning therewith, said flexible shaft having a socket end portion 10 wherein is detachably secured by means of a set screw 11, one end portion of a Short shaft`12 carrying vthe 60 round eraser wheel 13, and having ai swivel attachment end 14:. j

The wheel 5 Carries in the groove thereof a flexible strap or cable 15, wound thereupon, fastened at one end thereto and having a loose handle end 16, whereby when the strap is pulled out, which Should be done with a quick movement, the wheel is rotated, the ratchet wheel 4 and shafts 3 and 9 turh- A, ing therewith Yto rapidly rotate the eraser 7e wheel, which through the medium of 'the flexible shaft held at its endby theswivel attachment, is readily applied to the point to erased. When the strap 15'is released2 1t 1s automatically wound againupon the 75 wheel 5 by means of the helical spring, the i wheel 4, the flexible shaft and the eraser being unaffected by the opposite rotation of the pawl 'during this return movement.

The wheel 4 is-designed to be of such size` land weight as to -act somewhat as a/'fly-l wheel to give greater momentum. 'y f The device is conveniently attached tothe typewriting machine byvmeans of a screw', clamp 17 for attachment to the righthandl' front post of the frame, and having a pivot stud 18 carrying a swingingarm 19 upon the free endv portion of which the upright carrier 1 has support, moving therewith in an arc of a circle of which the pivot stud is a center, so that the whole device may be brought forward for use andI folded back again out of the way, or it may b'e swung around forwardly to rest over-the keys of 'j the typewriter. ln the `modified form of the invention, as i shown in Fig. of the drawings, a rigid shaft 2O is substituted for theflexible shaft, this shaft 20 carrying atits end the eraser wheel, which is turned in the same manner l as before stated for the main form of the invention., In this case however the up'- right carrier is formed in two parts 2l, 21a, having a pivotal joint at 22 whereby the. v v rigid shaft 20 carrying the eraser maybe 1 swung upward to bring the eraser infcon# tact with theprinted matter, and allowed to drop down again out of the way. A set erased, when the In some cases l may use push rod mechai nisin for pressingthe eraser against the type impression to be erased, as shown in Fig. 7

of the drawings.. This mechanism com prises a supporting bar 24,v y,designed inapplication to overlie the top of the typewriter machine frame at one side, and having adjustable rip pieces or screw clamp blocks 25, 25,v Willich will embrace said The bar 24 has a right-angle head 26, lchambered or'bored to receive the reciprocatory push rod 27, .a retracting spring 28 V,sur-

rounding-the push rod and having a bearing.

against a collar 28a thereof and aga-inst the- Y end wall 28b of the bore, serving to return the push rod to normal position after operation. The push rod carries at its inner end a vertical ring or4 snap-hook 29, having a sliding arcuate part() working'against Aa pressure spring 3l, which holds said part 30 n ormally in projected position toclose the ring.4 f

vIn use the end of the flexible shaft carrying the eraser is placed within the ring or snap hook 29, which is irst opened by pressing back the sliding piece 30, an indentation of the covering or sheath for the flexible shaft engaging the/wall of the snaphook and servin tol hold the eraser in the position desire VThe' push rod is now; operated to press the eraser-'against the matter to be erased, and the li'eXible strap or cable operated to rotate the eraser until the matter is i ush rod is released and the parts returne automatically to normal position, the eraser being carried therewith to normal position out of contact with the typewriter platen. f

The eraser and flexible shaft carrying the same may be removed from the snap hook at` any time, as will be obvious.

The eraser is designed to strike the platen a little toone side of the point, Where the type strike the platen, to avoid interference with the typewriter ribbon.

, The invention is shown as provided with means of attachment to the visible Remington typewriter, but other'means fattachment for other typewriting machines? may be rovided Without departure from the spirit of the invention The free adjustment of the parts of the carrying frame in connection with the lexi bility ofthe shaft upon which the eraser is lborne, will allow the eraser to bea plied to' matter for'erasure either while t epaper bearing such matter is upon the typewriting machine or apart from the same upon the v adjacent table. l

V In the application o f the invention to tyfpewriting machines the carriage of whichA l1 su ward, the push rod mechanism 4describe .may not be used, the eraser being appliedby hand pressure, as first described.

rotary brush attachment 33 may be subrame top.`

casing and anextension carrying an eraser wheel, and means for rotating said shaft and eraser wheel including a hollow grooved wheel in said casingupon said shaft, a flexible strap having attachment at one end Athereof to and wound upon said grooved wheel, and spring means within said hollow grooved wheel for rewindingthe strapl after operation thereof. I

2. An erasing attachment for' typewriting machines, comprising a clam connection with thev typewriter.' rame, a horizontal swinging arm vhaving a pivotal connection `withsaid clamp, an upright arm having connection with .said'horizontal 'arm a casing at its upper end, a

and havin rotary sha t having journal bearings in said casing and an extension carrying an eraser wheel, and means in saidcasing for rotating said shaft anderaser wheel. r A

3. An erasing attachment for typewriting machines, comprising a clamp for connec tion with the typewriter frame, an uprightv arm carried by said clamp and having a casing at its upper end, a rotary shaft having journal bearings in said casing yand an extension provided with a socket end portion, an` eraser'wheel having a shaft eXtension at one side thereof having' detachable engagement with saidsocket end ortion and a shaft extension at the oppositeside 75 vrotary sha t havingfjournal bearings i'n said ada ted for thereo having -an operating handle 'connection; and means in said casing for rotating said shaft and eraser wheel.

4. An erasing attachment for typewriting machines comprising a clamp adapted or connection with the typewriter frame, 'an

upright arm carried by .said clampy and having a casing at its upper end, a rotary\ shaft having journal bearings in said casz ing and an extension carrying an' eraserwheel, andgmeans located in said casing for4 rotating said shaft and eraser wheel, including a hellow grooved 'wheel upon s/aid internal lseries of ratchet teeth, a pivoted pawl device upon the side of said-grooved V wheelhavin' engagement with said ratchet teeth, a lexi le straphavinga'ttachment atoneiend to and wound upon said grooved wheel, and spring means within saidgrooved wheel for rewinding the strap after operation thereof. l

5. An attachment for typewriting`flij".N

shaft, a wheel at one side thereof having.- an` i chines, having in combination With a rotary shaft having a flexible extension carryin an eraser wheel, means for rotating sai shaft and eraser Wheel including a grooved Wheel and a flexible strap having attachment at one end to and Wound upon said grooved Wheel, and means for automatically rewinding the strap after operation thereof, push rod mechanism having a seat for the end of the flexible shaft adjacent to the eraser wheel, and provided with a retracting spring.

6. An attachment for typewriting machines, having in combination with a rotary shaft having an extension carrying an eraser Wheel, means for rotating said shaft and DON M. LEMON.

Witnesses: A

ROBERT E. BUFFUM, LUomP. GRAY. 

